20308953 has 16 divisors (see below), whose sum is σ = 31015296. Its totient is φ = 11579520.

The previous prime is 20308949. The next prime is 20308957. The reversal of 20308953 is 35980302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20308949) and next prime (20308957).

It is not a de Polignac number, because 20308953 - 2² = 20308949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20308953.

It is not an unprimeable number, because it can be changed into a prime (20308957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12973 + ... + 14453.

It is an arithmetic number, because the mean of its divisors is an integer number (1938456).

Almost surely, 2^20308953 is an apocalyptic number.

It is an amenable number.

20308953 is a deficient number, since it is larger than the sum of its proper divisors (10706343).

20308953 is a wasteful number, since it uses less digits than its factorization.

20308953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 20308953 is about 4506.5455728307. The cubic root of 20308953 is about 272.8323381154.

The spelling of 20308953 in words is "twenty million, three hundred eight thousand, nine hundred fifty-three".